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GC Algorithm
The type of garbage collector (GC) that the Virtual Machine is using.
JRockit provides the following types of GCs:
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Generational Copying, which is suitable for testing applications on a desktop machine with a small (less then 128 MB) heap.
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Single Spaced Concurrent, which reduces or eliminates pauses in the VM that are due to garbage collection. Because it trades memory throughput for reduced pause time, you generally need a larger heap size than with other GC types. If your ordinary Java threads create more garbage than this GC can collect, the VM will pause while the Java threads wait for the garbage collection to finish.
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Generational Concurrent, which creates a "nursery" space within the heap. New objects are created within the nursery. When the nursery is full, JRockit "stops-the-world," removes the dead objects from the nursery, and moves live objects to a different space within the heap. Another thread runs in the background to remove dead objects from the non-nursery space. This GC type has a higher memory throughput than a single spaced concurrent GC.
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Parallel, which allocates all objects to a single spaced heap. When the heap is full, all Java threads are stopped and every CPU is used to perform a complete garbage collection of the entire heap. This behavior causes longer pause times than for the concurrent collectors but maximizes memory throughput.
MBean Attribute:JRockitRuntimeMBean.GcAlgorithm
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